Electric-arc lamp.



W. R. RIDINGS. ELEGTRIG ARG LAMP. APPLICATION I'ILED r212. 20, 1904.

Patented Feb. 23, 1909.

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UNITED STATES PA evere Wm il A t/Eh WILLIAM REGINALD BIDINGS, OF STRE'IFORD, ENGLAND, ASSIG-NOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

To all whom it may concern:

ELECTRIC-ARC LAIVIP.

Specification of Letters Patent.

Application filed February 20, 1904.

Be it known that I, WILLIAM REGINALD RIDINGs, a subject of the King of Great Britain, and a resident of Fernside, Steven street, Stretford, in the county of Lancaster, England, have invented certain 116" T and useful Improvements in Electric-Arc Lamps, or" which the following is a specification.

This invention relates to electric arc lamps.

One object of this invention is to provide improved means for cutting out, as soon as the arc is formed, the coils employed for operating the striking and feedin mechanism, said coils being cut in again by means of a shunt wound magnet when the electrodes are required to feed.

For cutting in the coils when the are be comes longer than is normal, there is provided a magnet connected in shunt across the are, said magnet having an armature, the contacts of which are connected in parallel with the contacts of the armature oi the controlling magnet above referred to.

In the accompanying drawings the invention is lllustrated by way of example, as applied to a lamp of that kind in which the electrodes are inclined with reference to each other, and are provided with a magnet for controlling the shape and position of the BIG.

The drawing is mainly diagrammatic showing the arrangement or the electrical circuits of the lamp according to thls mvention.

said magnet 1 is deenergized.

When, how- Patented Feb. 23, 1909.

Serial No. 194,526.

magnet 7, becoming energized and attracting its armature, 8, whereby the circuit of the coils 6 is completed, unles. by some means the armature 8 becomes deranged or the current in the shunt is insufficient to energize the magnet 7, in which case the increasing resistance in the arc will eventually become so great as to cause the magnet 1 to release its armature 2 and complete the circuit of the coils 6 in the same wa as it does before the arc is actually struck.

It will be observed from the description given above that for the greater portion of the time during which the lamp is in opera tion the coils 6 and resistance 5 are cut out of circuit, the expenditure of energy in passing current through said coils and resistance during this part oi the time being thereby avoi led.

I claim as my invention In an electric arc lamp, a pair of electrodes, a relay magnet in series therewith, a shunt circuit including a feeding magnet and a separate shunt circuitincluding a relay magnet, means adapted to be operated by the first named magnet for cutting out the feed magnet during the normal operation of the lamp, and means adapted to be operated by the last named magnet for cutting in the feed magnet when the resistance in the electrode circuit becomes abnormally great.

Signed at London in the county of MiddleseX England this twenty seventh day of January A. D. 1904.

WILLIAM REGINALD RIDINGS.

Viitnesses i- I. M. BERG-IN, l VALTER J SKERTEN. 

